USG Flex 100H - Firewall ZYXEL - Free user manual and instructions
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| Product Type | Unified Security Gateway (Firewall) |
| Brand | ZyXEL |
| Model | USG Flex 100H |
| Dimensions (W x D x H) | 260 x 170 x 44 mm |
| Weight | 1.5 kg |
| Power Supply | 12 V DC, 3 A external adapter |
| Power Consumption | 25 W (max) |
| Firewall Throughput | 1 Gbps |
| VPN Throughput | 500 Mbps |
| Maximum Concurrent Sessions | 300,000 |
| Interfaces | 4 x Gigabit Ethernet LAN, 1 x Gigabit Ethernet WAN |
| Supported VPN Protocols | IPsec, SSL, L2TP, PPTP |
| Security Features | Stateful firewall, intrusion prevention, anti-malware, content filtering |
| Management | Web GUI, CLI, ZyXEL Cloud |
| Warranty | 1 year limited hardware warranty |
| Operating Temperature | 0°C to 40°C |
| Storage Temperature | -20°C to 60°C |
| Humidity | 10% to 90% (non-condensing) |
| Maintenance | Keep vents clean, update firmware regularly |
| Spare Parts | Power adapter available, internal parts not user-serviceable |
Frequently Asked Questions - USG Flex 100H ZYXEL
How do I perform a factory reset on the USG Flex 100H?
Press and hold the Reset button on the front panel for at least 10 seconds using a paperclip until the system LED blinks rapidly.
How can I access the web configuration interface?
Connect a computer to a LAN port, set your PC to obtain an IP address automatically, then open a browser and go to 192.168.1.1. Default login credentials are admin/1234.
Can I use this device as a VPN server?
Yes, the USG Flex 100H supports IPsec, SSL, L2TP, and PPTP VPN. Configure VPN settings under VPN > IPSec VPN or SSL VPN in the web GUI.
What is the default IP address of the device?
The default IP address is 192.168.1.1 with subnet mask 255.255.255.0.
How do I update the firmware?
Download the latest firmware from ZyXEL's support site. Go to Maintenance > Firmware Upgrade in the web GUI, select the file, and click Upgrade. Do not power off during update.
The device is overheating. What should I do?
Ensure the vents are not blocked and the device is placed in a well-ventilated area. Check that the ambient temperature is within 0°C to 40°C. If persistent, contact support.
How can I change the admin password?
Go to System > Users in the web GUI, select the admin account, and enter a new password. Use a strong password with at least 8 characters.
Why can't I access the internet after installation?
Check that the WAN cable is connected and your ISP settings (PPPoE, static IP, etc.) are correctly configured under Network > WAN. Also verify firewall rules are not blocking traffic.
Is there a mobile app to manage the firewall?
ZyXEL offers the ZyXEL Cloud app for iOS and Android for basic monitoring and management of your USG Flex device.
What is the maximum number of VPN tunnels supported?
The USG Flex 100H supports up to 50 simultaneous IPSec VPN tunnels and 100 SSL VPN users.
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USER MANUAL USG Flex 100H ZYXEL
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Product information
Brand : ZYXEL
Model : USG Flex 100H
Category : Firewall